(a-3b)(a-b/5)=0
a^2-ab/5-3ab+3b^2/5=0
1-16/5*1*1*cosx+3/5*1=0
8/5=16/5*cosx
cosx=8/5:(16/5)=1/2
x=60 градусов
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(a-3b)(a-b/5)=0
a^2-ab/5-3ab+3b^2/5=0
1-16/5*1*1*cosx+3/5*1=0
8/5=16/5*cosx
cosx=8/5:(16/5)=1/2
x=60 градусов